无负压供水设备又称管网压力叠加供水设备。工作时可直接与市政管网连接，补偿补加的压差供水量，即在此压差基础上增加多少压差。因此，原则上:只要采用差值补偿供水比不采用差值补偿供水更节能，但节能系数也是根据城市水压和建筑高度来确定的。

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